MPEG member, Jim Delahoyde sent me this acronym he devised to help remind him about checking his camera settings before/during each shoot. How many times have you forgotten to do this and got burned? I am guilty and I even teach this stuff in my nature photography seminars!
W = Check to insure correct White Balance
I = Check to insure ISO is set correctly. Your last shot may have been at night ISO 1600, and now you are in bright sunlight
S = Check Shutter Speed to match what is being capture.
E = Check Histogram for applicable Exposure Compensation.
D = Check (aperture) Depth of Field to insure what you want in focus is in focus.